System and method for enriching and recovering rare earth elements in acid mine wastewater

The invention provides a system and a method for enriching and recovering rare earth elements in acid mine wastewater, and belongs to the technical field of rare earth element recovery. The system for enriching and recovering the rare earth elements in the acid mine wastewater comprises an adjusting tank, a sludge washer, a neutralizer, a buffer water tank, a primary reactor, a secondary reactor, a filter, a dewatering tank I, a dewatering tank II, an acid pickling soaking tank and a sludge dewatering tank. The system is used for recovering rare earth elements, the pH value of the acid mine wastewater is increased by adding the alkaline substance, and the agent cost for recovering the rare earth elements can be remarkably reduced; the dewatered sludge is subjected to acid pickling, the rare earth elements attached to the dewatered sludge are transferred into the leachate through acid pickling, the leachate returns to the buffer water pool again, the loss of the rare earth elements is further reduced, and the